Small block coolant bypass hose diameter?

Thanks you for the advice but these damn pulley sets cost $600 So I'm not willing to drop any of them at that price. I still get pissed ever time I look at the alternator missing it's pulley from the kit. But I will take the advice and leave the hose diameter alone. I may still need to install a temp gauge in the line for my efi setup. Not sure, may look into drilling and taping a spot that currently has a plug because it's to small for the sensor.

Thanks